masking.rb in chunky_png-1.3.12

- old
+ new

@@ -1,15 +1,13 @@
 module ChunkyPNG
   class Canvas
-    
     # The ChunkyPNG::Canvas::Masking module defines methods to perform masking
     # and theming operations on a {ChunkyPNG::Canvas}. The module is included into the Canvas class so all
     # these methods are available on every canvas.
     #
     # @see ChunkyPNG::Canvas
     module Masking
-
       # Creates a new image, based on the current image but with a new theme color.
       #
       # This method will replace one color in an image with another image. This is done by
       # first extracting the pixels with a color close to the original theme color as a mask
       # image, changing the color of this mask image and then apply it on the original image.
@@ -19,39 +17,39 @@
       # the extraction process.
       #
       # @param [Integer] old_theme_color The original theme color in this image.
       # @param [Integer] new_theme_color The color to replace the old theme color with.
       # @param [Integer] bg_color The background color on which the theme colored pixels are placed.
-      # @param [Integer] tolerance The tolerance level to use when extracting the mask image. Five is 
-      #    the default; increase this if the masked image does not extract all the required pixels, 
+      # @param [Integer] tolerance The tolerance level to use when extracting the mask image. Five is
+      #    the default; increase this if the masked image does not extract all the required pixels,
       #    decrease it if too many pixels get extracted.
       # @return [ChunkyPNG::Canvas] Returns itself, but with the theme colored pixels changed.
       # @see #change_theme_color!
       # @see #change_mask_color!
       def change_theme_color!(old_theme_color, new_theme_color, bg_color = ChunkyPNG::Color::WHITE, tolerance = 5)
         base, mask = extract_mask(old_theme_color, bg_color, tolerance)
         mask.change_mask_color!(new_theme_color)
-        self.replace!(base.compose!(mask))
+        replace!(base.compose!(mask))
       end
-      
+
       # Creates a base image and a mask image from an original image that has a particular theme color.
       # This can be used to easily change a theme color in an image.
       #
       # It will extract all the pixels that look like the theme color (with a tolerance level) and put
       # these in a mask image. All the other pixels will be stored in a base image. Both images will be
       # of the exact same size as the original image. The original image will be left untouched.
       #
-      # The color of the mask image can be changed with {#change_mask_color!}. This new mask image can 
-      # then be composed upon the base image to create an image with a new theme color. A call to 
+      # The color of the mask image can be changed with {#change_mask_color!}. This new mask image can
+      # then be composed upon the base image to create an image with a new theme color. A call to
       # {#change_theme_color!} will perform this in one go.
       #
       # @param [Integer] mask_color The current theme color.
       # @param [Integer] bg_color The background color on which the theme colored pixels are applied.
-      # @param [Integer] tolerance The tolerance level to use when extracting the mask image. Five is 
-      #    the default; increase this if the masked image does not extract all the required pixels, 
+      # @param [Integer] tolerance The tolerance level to use when extracting the mask image. Five is
+      #    the default; increase this if the masked image does not extract all the required pixels,
       #    decrease it if too many pixels get extracted.
-      # @return [Array<ChunkyPNG::Canvas, ChunkyPNG::Canvas>] An array with the base canvas and the mask 
+      # @return [Array<ChunkyPNG::Canvas, ChunkyPNG::Canvas>] An array with the base canvas and the mask
       #    canvas as elements.
       # @see #change_theme_color!
       # @see #change_mask_color!
       def extract_mask(mask_color, bg_color = ChunkyPNG::Color::WHITE, tolerance = 5)
         base_pixels = []
@@ -64,13 +62,13 @@
           else
             mask_pixels << (mask_color & 0xffffff00)
             base_pixels << pixel
           end
         end
-        
-        [ self.class.new(width, height, base_pixels), self.class.new(width, height, mask_pixels) ]
+
+        [self.class.new(width, height, base_pixels), self.class.new(width, height, mask_pixels)]
       end
-      
+
       # Changes the color of a mask image.
       #
       # This method works on a canvas extracted out of another image using the {#extract_mask} method.
       # It can then be applied on the extracted base image. See {#change_theme_color!} to perform
       # these operations in one go.